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Igor,
Perhaps this is no news to you, but there may be something else in the work, other than the pwrite failing. As you know well, the filesystems engaged in the recovery mode were not touched by the update. Therefore pwrite should continue working as it used to, right?
I am in no way an expert in CRAMFS, but I noticed that the format of the images presented by the update are somewhat different from what we had seen earlier. The superblock's flags field is zeroed out, the FS length field doesn't seem to make sense, and there are some other fields, which seem incorrect. Perhaps mtdmount (the Sony tool responsible for mounting filesystems) has been changed to look for certain parameters, which makes it impossible to mount a mkcramfs-generated image?
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